<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div{
				width: 200px;
				height: 200px;
				border: 10px red solid;
/* 				border-top-width: 10px;
				border-top-color: #008000;
				border-top-style: solid; */
				border-radius: 100%;
			}
		</style>
	</head>
	<body>
		<div>我是块</div>
	</body>
</html>
